Lambda Parallelization - Collect Results

Add logic to get results from GroundMotionToCurves Lambda function.

Requires #151 (closed)

See nshmp-haz#489

changed milestone to %Lambda Parallelization of nshmp-haz

assigned to @bclayton

mentioned in issue #153

changed title from Lambda Parallelization - Add Lambda Function to Collect Results to Lambda Parallelization - Collect Results

changed the description

mentioned in issue nshmp-haz#489

added To Do label